These data refers to biological data of some of the main commercial marine species of the Gulf of Lions. The biological informations collected refer to growth curves in size and weight and sexual maturity. The species selected are commercial species such as fish (Dicentrarchus labrax, Engraulis encrasicolus, Liza ramada, Mugil cephalus, Lophius budegassa, Merluccius merluccius, Mullus barbatus barbatus, Mullus surmuletus, Pagellus erythrinus, Raja clavata, Sardina pilchardus, Scyliorhinus canicula, Scomber scombrus, Solea solea, Sparus aurata, Trachurus  trachurus, Trisopterus minutus capelanus, Thunnus thynnus), cephalopods (Eledone cirrhosa, Octopus vulgaris) and crustaceans (Parapenaeus longirostris)